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Building and Housing Minister Dr Nick Smith has ordered an investigation into the collapse of a balcony during a Six60 concert which injured 18 university students.

The Ministry of Business, Innovation and Employment has been asked to prepare a report on the incident at the Castle Street townhouse on Friday night which will look at whether the balcony was up to the standards required by law under the Building Code.

"Structural failure of buildings are rare in New Zealand but every incident of this sort needs to be thoroughly investigated to establish whether there were failings and whether our building systems are working as they should," he said.